搞不懂以下这两个结构体为什么可以转换uint16 SampleApp_ProcessEvent( uint8 task_id, uint16 events )[ afIncomingMSGPacket_t * MSGpkt; if ( events & SYS_EVENT_MSG ) [ MSGpkt = (afIncomingMSGPacket_t *)osal_msg_receive( SampleApp_TaskID ); while ( MSGpkt ) [ switch ( MSGpkt->hdr.event ) [ case KEY_CHANGE: SampleApp_HandleKeys( ((keyChange_t *)MSGpkt)->state, ((keyChange_t *)MSGpkt)->keys ); break;1typedef struct[ osal_event_hdr_t hdr; uint8 state; // shift uint8 keys; // keys] keyChange_t;typedef struct[ osal_event_hdr_t hdr; /* OSAL Message header */ uint16 groupId; /* Message's group ID - 0 if not set */ uint16 clusterId; /* Message's cluster ID */ afAddrType_t srcAddr; /* Source Address, if endpoint is STUBAPS_INTER_PAN_EP, it's an InterPAN message */ uint16 macDestAddr; /* MAC header destination short address */ uint8 endPoint; /* destination endpoint */ uint8 wasBroadcast; /* TRUE if network destination was a broadcast address */ uint8 LinkQuality; /* The link quality of the received data frame */ uint8 correlation; /* The raw correlation value of the received data frame */ int8 rssi; /* The received RF power in units dBm */ uint8 SecurityUse; /* deprecated */ uint32 timestamp; /* receipt timestamp from MAC */ afMSGCommandFormat_t cmd; /* Application Data */] afIncomingMSGPacket_t;
搞不懂以下这两个结构体为什么可以转换uint16 SampleApp_ProcessEvent( uint8 task_id, uint16 events )[ afIncomingMSGPacket_t * MSGpkt; if ( events & SYS_EVENT_MSG ) [ MSGpkt = (afIncomingMSGPacket_t *)osal_msg_receive( SampleApp_TaskID ); while ( MSGpkt ) [ switch ( MSGpkt->hdr.event ) [ case KEY_CHANGE: SampleApp_HandleKeys( ((keyChange_t *)MSGpkt)->state, ((keyChange_t *)MSGpkt)->keys ); break;1typedef struct[ osal_event_hdr_t hdr; uint8 state; // shift uint8 keys; // keys] keyChange_t;typedef struct[ osal_event_hdr_t hdr; /* OSAL Message header */ uint16 groupId; /* Message's group ID - 0 if not set */ uint16 clusterId; /* Message's cluster ID */ afAddrType_t srcAddr; /* Source Address, if endpoint is STUBAPS_INTER_PAN_EP, it's an InterPAN message */ uint16 macDestAddr; /* MAC header destination short address */ uint8 endPoint; /* destination endpoint */ uint8 wasBroadcast; /* TRUE if network destination was a broadcast address */ uint8 LinkQuality; /* The link quality of the received data frame */ uint8 correlation; /* The raw correlation value of the received data frame */ int8 rssi; /* The received RF power in units dBm */ uint8 SecurityUse; /* deprecated */ uint32 timestamp; /* receipt timestamp from MAC */ afMSGCommandFormat_t cmd; /* Application Data */] afIncomingMSGPacket_t;
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